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Ruby is a highly valuable gemstone found in nature. Its most distinctive feature is its brilliant red color, which is caused by the presence of chromium within the stone. Rubies are commonly used in jewelry because they are extremely hard and resistant to scratching. In terms of hardness, they are among the most durable gemstones, second only to diamond. How Are Rubies Formed? Rubies form deep within the Earth’s crust under conditions of extremely high temperature and pressure. These stones are